Integrated motor driver circuit

Abstract

DEPCT64 Integrated drive motor (100) with internal and external components including tubular rotor (2). This includes the rotating shaft (3) which is fixed to the center section and includes the permanent magnet and stator (1) which are It is placed on the outer side of the rotor (2), where the stator includes the iron core and a number of windings (6). Wrapped around a roll frame with a roll frame in between, an integrated drive motor (100) It also includes the opposite load-bearing slip-on support for the rotating shaft (3), one side of which is in the axial direction of The rotating shaft (3) is the load side and the other side in the axial direction of the rotating shaft (3) is the forward side. Crossload, a metal bracket (9) is positioned on the opposite side of the load relative to the rotor (2). and stator (1) in which the mounting bracket includes the slide housing in which the slide housing slides toward the load side and Opposite load slip mount, opposite load connector block (13a) positioned on the opposite side. Load relative to the bracket (9) in the axial direction and the circuit substrate (20) placed on Opposite load side of the opposite load terminal block (13a) where the driver circuit is mounted on the substrate. cycle -----------------------------------------------------------

Description

Drive circuit mounted motor

[0001] The present invention relates to an internal rotation type electric motor equipped with a drive circuit.

[0002] When a drive circuit is installed inside an electric motor with a rotor containing a permanent magnet, the drive circuit must be positioned so as not to interfere with the stator, coils, rotating shaft, or bearings that hold the rotating shaft. The rotating shaft and bearings are located at the radial center of the cylindrical motor, and if a large drive circuit is to be installed to avoid the positions of the rotating shaft and bearings, the radial dimension of the motor must be increased.

[0003] Patent Document 1 discloses a motor equipped with a drive circuit, in which a circuit board is mounted using the spacious central portion of the motor, and the circuit board on which the drive circuit is mounted is attached to the axial outer side of a bracket. In the motor disclosed in Patent Document 1, a bearing housing that holds a bearing on the non-load side that supports the rotating shaft is formed in a shape that protrudes axially inward from a resin bracket. In addition, a circuit board equipped with a rotor position detector for detecting the position of the rotor (the stator) is attached to the axial outer end face of the bracket.

[0004] Patent No. 5473968

[0005] According to the motor of Patent Document 1, rotor position is detected by magnetic flux generated by the rotor. To improve the accuracy of rotor position detection, the rotor needs to be placed closer to a circuit board equipped with a rotor position detector. To prevent the rotor from becoming larger than necessary in the axial direction of the bracket, the circuit board needs to be placed closer to the rotor, which means that the stator coil also needs to be placed closer to the circuit board. If the stator coil is placed closer to the drive circuit of the circuit board than necessary, there is a risk that the drive circuit may malfunction due to increased electromagnetic noise generated by current flowing through the stator coil, resulting in deterioration of the motor's drive characteristics.

[0006] The present invention has been made in consideration of the above, and aims to provide an electric motor equipped with a drive circuit that makes effective use of internal space and can accommodate a large circuit board without increasing size or degrading characteristics.

[0007] In order to solve the above-mentioned problems and achieve the object, the present invention provides an electric motor equipped with a drive circuit, the electric motor including a cylindrical rotor having a permanent magnet inside an outer casing and a rotating shaft fixed at its center, and a stator arranged on the outer periphery of the rotor and having an iron core and a plurality of coils wound around a reel via a reel. When one direction along the axial direction of the rotating shaft is the load side and the other direction along the axial direction of the rotating shaft is the anti-load side, the electric motor equipped with a drive circuit also includes: an anti-load side bearing that supports the rotating shaft, a metal bracket arranged on the anti-load side of the rotor and the stator and having a bearing housing that holds the anti-load side bearing and protrudes toward the load side, a anti-load side terminal block arranged on the anti-load side of the bracket in the axial direction, and a circuit board arranged on the anti-load side of the anti-load side of the anti-load side terminal block and on which a drive circuit is mounted.

[0008] The drive circuit mounted electric motor according to the present invention has the advantage that it can effectively utilize the internal space and mount a large circuit board without increasing the size or deteriorating the characteristics.

[0009] FIG. 1 is a longitudinal sectional view of an electric motor equipped with a drive circuit according to a first embodiment of the present invention; FIG. 2 is a perspective view of a stator of an electric motor equipped with a drive circuit according to a first embodiment of the present invention; FIG. 3 is a perspective view of an insulating member of an electric motor equipped with a drive circuit according to a first embodiment of the present invention; FIG. 4 is a perspective view of a bracket of an electric motor equipped with a drive circuit according to a first embodiment of the present invention; FIG. 5 is a perspective view of a counter-load side terminal block of an electric motor equipped with a drive circuit according to a first embodiment of the present invention; FIG. 6 is a diagram showing another form of a counter-load side terminal according to the first embodiment of the present invention;

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A drive circuit mounted electric motor according to an embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments.

[0011] First Embodiment Fig. 1 is a longitudinal cross-sectional view of a motor 100 equipped with a drive circuit according to a first embodiment of the present invention. Fig. 2 is a perspective view showing a stator 1 of the motor 100 equipped with a drive circuit according to the first embodiment of the present invention. Note that Fig. 2 shows a state in which the coil 6 is not wound.

[0012] The drive circuit-equipped electric motor 100 according to the first embodiment is an internally rotating permanent magnet synchronous motor in which a rotor 2 rotates within a stator 1. The drive circuit-equipped electric motor 100 includes a frame 7 and a cover 22 that form an outer shell of the drive circuit-equipped electric motor 100. Inside the outer shell formed by the frame 7 and the cover 22, the drive circuit-equipped electric motor 100 also includes a cylindrical stator 1, a cylindrical rotor 2 that is disposed inside the stator 1, and a rotating shaft 3 that is connected to the rotor 2 and extends along a central axis 2a of the rotor 2. The stator 1, the rotor 2, and the rotating shaft 3 are coaxially arranged. Hereinafter, the axial direction of the stator 1, the rotor 2, and the rotating shaft 3 may be simply referred to as the axial direction. Furthermore, the radial direction about the axial direction of the stator 1, the rotor 2, and the rotating shaft 3 may be simply referred to as the radial direction.

[0013] One end 3a of the rotating shaft 3 protrudes outside the frame 7. A load (not shown) is connected to the end 3a of the rotating shaft 3 protruding outside the frame 7. Hereinafter, in the axial direction of the rotating shaft 3, the side on which the rotating shaft 3 protrudes outside the frame 7, i.e., the lower side in FIG. 1, may be referred to as the load side, and the other side opposite to the direction on which the rotating shaft 3 protrudes outside the frame 7, i.e., the upper side in FIG. 1, may be referred to as the anti-load side.

[0014] The stator 1 has a cylindrical shape and includes a stator core 4, an insulator 5, and a coil 6. The stator 1 is press-fitted into a frame 7 that forms the outer shell of the drive circuit-equipped electric motor 100, and is disposed around the rotor 2. The stator 1 is composed of a stator core 4 that is formed by laminating a large number of thin electromagnetic steel sheets, and a plurality of coils 6 that are stator windings in which magnet wire is wound with multiple turns between two stator slots 1a that are through holes provided in the teeth of the stator core 4. That is, the coils 6 are formed by winding magnet wire around a bobbin that is disposed around the stator core 4. The magnet wire is wound between the two stator slots 1a via the insulator 5, which is a bobbin made of an insulating material.

[0015] Furthermore, a first conductive pin 8a, which is a coil connection conductive pin for electrically connecting the coil 6 to a circuit board 20 (described later), and a second conductive pin 8b, which is an external power supply connection conductive pin for electrically connecting the circuit board 20 to an external power supply (not shown), extend upright from the upper surface of the insulator 5, i.e., the anti-load side of the insulator 5. The first conductive pin 8a and the second conductive pin 8b are inserted into the upper surface of the insulator 5. The end of the coil 6 is wound around the first conductive pin 8a multiple times, and is electrically connected to the end of the coil 6 by soldering.

[0016] The coil 6 is configured as a concentrated winding wound around two adjacent stator slots 1a of the stator core 4. Concentrated winding allows the size of the coil 6 in the axial direction of the stator 1 to be smaller than distributed winding, in which the coil 6 is wound around stator slots 1a that are spaced apart by two or more. Therefore, the coil 6 configured as a concentrated winding has the advantage of being able to reduce the outer diameter of the drive circuit-equipped electric motor 100.

[0017] The electric motor 100 equipped with a drive circuit uses a coil 6 configured with concentrated winding, and even though it is equipped with a circuit board 20, it can be housed within the same outer diameter dimensions as when a coil configured with distributed winding is used, making it suitable for replacing a permanent magnet synchronous motor that uses a coil configured with distributed winding.

[0018] The rotor 2 is rotatably supported by two bearings that are arranged on either side of the rotor 2 in the axial direction of the rotating shaft 3. That is, the rotor 2 is rotatably supported by a first bearing 10a that is a first bearing and a second bearing 10b that is a second bearing.

[0019] The first bearing 10a on the load side of the bearing has its outer ring fitted and fixed in a recess formed in the center of the frame 7 that forms the outer shell, and its inner ring fitted and fixed on the rotating shaft 3. In other words, the outer ring of the first bearing 10a is supported by the inner peripheral surface of a first bearing housing 11a, which is a first bearing housing provided on the frame 7. The first bearing housing 11a is formed in an annular shape and protrudes toward the inside of the frame 7, i.e., the anti-load side, in the axial direction of the rotating shaft 3.

[0020] The second bearing 10b on the anti-load side of the bearing has its outer ring fitted and fixed in a recess formed in the center of a metal bracket 9 that supports the second bearing 10b on the anti-load side of the rotor 2, and its inner ring fitted and fixed to the rotating shaft 3. That is, the outer ring of the second bearing 10b is supported by a second bearing housing 11b that is a second bearing housing provided on the bracket 9. The second bearing housing 11b of the bracket 9 is formed in an annular shape and protrudes toward the interior of the bracket 9, i.e., the load side, in the axial direction of the rotating shaft 3. The end face of the bracket 9 in the axial direction, i.e., the end face 9a on the anti-load side of the bracket, is a generally flat surface.

[0021] A minute gap is formed between the outer diameter of the rotor 2 and the inner diameter of the stator 1 so that it is uniform around the entire circumference. The rotor 2 has a permanent magnet. That is, the rotor 2 is a plastic magnet made by mixing the raw materials for a permanent magnet with resin and molding it, and has magnetic poles on the outer diameter side, with alternating north and south poles, spaced equally apart in the circumferential direction. It is preferable that the entire rotor 2 is made of a plastic magnet, but it is not necessary that only a portion of the rotor 2 is made of a plastic magnet. That is, the rotor 2 is constructed with a plastic magnet. A rotating shaft 3 is inserted in the center of the rotor 2.

[0022] FIG. 3 is a perspective view showing an insulating member 16 of the drive circuit-equipped electric motor 100 according to the first embodiment of the present invention. The insulating member 16, which has a hole through which the first conductive pin 8a and the second conductive pin 8b penetrate, is disposed coaxially with the stator 1 on the end face and side surface of the insulator 5 on the anti-load side. The insulating member 16 has a flat portion 16a, a side surface portion 16b, and a protruding portion 16c. The flat portion 16a has a diameter substantially equal to the outer diameter of the insulator 5 and covers the anti-load side of the insulator 5. The side surface portion 16b has an inner diameter larger than the outer diameter of the insulator 5 and extends from the flat portion 16a to cover the side surface of the insulator 5. The protruding portion 16c protrudes from the flat portion 16a toward the anti-load side and has a hole through which the first conductive pin 8a or the second conductive pin 8b penetrates, protecting the first conductive pin 8a and the second conductive pin 8b that penetrate the protruding portion 16c.

[0023] 4 is a perspective view showing the bracket 9 of the drive circuit-equipped electric motor 100 according to the first embodiment of the present invention. A metal bracket 9 is disposed on the anti-load side of the insulating member 16, and is provided with through holes 9b through which the first conductive pin 8a or the second conductive pin 8b and the protrusion 16c of the insulating member 16 pass. The end face 9a on the anti-load side of the bracket in the axial direction of the rotating shaft 3, i.e., the upper surface of the bracket 9, is generally flat.

[0024] In the drive circuit-equipped electric motor 100, the metal bracket 9 is disposed on the anti-load side of the insulating member 16, so that electromagnetic noise generated by passing a current through the coil 6 of the stator 1 is reflected or absorbed by the bracket 9. Therefore, in the drive circuit-equipped electric motor 100, the electromagnetic noise can be blocked by the bracket 9, and the electromagnetic noise can be prevented from adversely affecting the anti-load side of the bracket 9.

[0025] 5 is a perspective view showing a counter-load side terminal block 13a of the drive circuit-equipped electric motor 100 according to the first embodiment of the present invention. The counter-load side terminal block 13a, which is a first terminal block having holes through which the first conductive pin 8a or the second conductive pin 8b and the protrusion 16c of the insulating member 16 pass, is disposed on the counter-load side end face 9a of the bracket. The counter-load side terminal block 13a has an outer diameter substantially equal to the outer diameter of the counter-load side end face 9a of the bracket, and is disposed coaxially with the bracket 9, covering the counter-load side end face 9a of the bracket. That is, the counter-load side terminal block 13a is disposed on the counter-load side of the bracket 9 in the axial direction. The counter-load side terminal block 13a is formed in the shape of a circular shallow container made of an insulating material such as resin.

[0026] The counter-load side terminal block 13a has a plurality of counter-load side terminals 14a, each having a hole through which the first conductive pin 8a or the second conductive pin 8b passes, and is used for wiring. The counter-load side terminal block 13a also has a power supply lead 17, which is connected from the counter-load side terminals 14a to an external power supply (not shown), housed in a recess provided therein. The counter-load side terminal block 13a also has a circuit board 20, on which a drive circuit is mounted and which controls the drive of the drive circuit-equipped electric motor 100. The circuit board 20 is disposed on a protrusion 24 that protrudes from an inner bottom surface 21 of the counter-load side terminal block 13a along an inner circumferential surface 23 of a peripheral wall 19 (described later) toward the counter-load side. That is, the circuit board 20 is disposed on the counter-load side of the counter-load side terminal block 13a, more specifically, inside the counter-load side terminal block 13a and toward the counter-load side of the counter-load side terminal block 13a.

[0027] The first conductive pin 8a and the second conductive pin 8b penetrate the bottom of the counter-load side terminal block 13a and protrude axially toward the counter-load side. In the counter-load side terminal block 13a, the first conductive pin 8a, the second conductive pin 8b, the power lead wire 17, and the drive circuit of the circuit board 20 are electrically connected using the counter-load side terminal 14a. The second conductive pin 8b and the counter-load side terminal 14a are electrically connected by soldering or welding. The counter-load side terminal 14a and the power lead wire 17 are electrically connected by soldering or welding.

[0028] The counter-load side terminal 14 a is disposed in a terminal storage portion 18 a, which is a recess for storing the counter-load side terminal 14 a. The depth of the terminal storage portion 18 a is set to be greater than or equal to the thickness of the counter-load side terminal 14 a, and the counter-load side terminal 14 a stored in the terminal storage portion 18 a does not protrude from the inner bottom surface 21 of the counter-load side terminal block 13 a.

[0029] Fig. 6 is a diagram showing another form of the counter-load side terminal 14a according to the first embodiment of the present invention. The counter-load side terminal 14a may be a round crimp terminal as shown in Fig. 6, instead of the plate-shaped terminal as shown in Fig. 5. In this case, too, the second conductive pin 8b, the power supply lead wire 17, and the drive circuit of the circuit board 20 can be electrically connected using the counter-load side terminal 14a in the counter-load side terminal block 13a.

[0030] The power lead wire 17 is routed to the outside of the anti-load side terminal block 13a while being stored in a power lead wire storage groove 18b, which is a groove for storing the power lead wire 17. The depth of the power lead wire storage groove 18b is set to be greater than or equal to the thickness of the power lead wire 17, so that the power lead wire 17 stored in the power lead wire storage groove 18b does not protrude from the inner bottom surface 21 of the anti-load side terminal block 13a. It is preferable that the power lead wire storage grooves 18b are set to a height that allows only one power lead wire 17 to be stored in each groove.

[0031] 7 is a diagram schematically illustrating electrical connection paths in the drive circuit-equipped electric motor 100 according to the first embodiment of the present invention. In the drive circuit-equipped electric motor 100, the external power supply, power supply lead wire 17, counter-load terminal 14a, second conductive pin 8b, circuit board 20, first conductive pin 8a, and coil 6 are electrically connected in this order. A commercial AC voltage is applied to the circuit board 20 from the external power supply via the power supply lead wire 17, counter-load terminal 14a, and second conductive pin 8b.

[0032] When a commercial AC voltage is applied to the circuit board 20 from the outside, the commercial AC voltage is converted to a DC voltage by a power supply circuit mounted on the circuit board 20. Then, a control circuit of a drive circuit mounted on the circuit board 20 switches on the DC voltage, causing a current to flow in a specific direction through the coil 6 of the stator 1 via the first conductive pin 8a, causing the rotor 2 to rotate. The direction of the current flowing through the coil 6 is changed depending on the angular position of the rotor 2. The drive circuit mounted on the circuit board 20 estimates the position of the rotor 2 based on information about the back electromotive force generated when the coil 6 passes through the magnetic flux of the rotor 2. The drive circuit then controls the rotation of the rotor 2 by passing a current in a specific direction through a specific coil 6 depending on the position of the rotor 2, thereby controlling the rotation of the rotor 2 using a sensorless drive system.

[0033] That is, the drive circuit-equipped electric motor 100 is a sensorless motor that is driven by so-called position sensorless control, without using a position detection sensor such as a Hall sensor, an encoder, or a resolver that detects the position of the rotor 2. Note that the sensorless drive method for the drive circuit-equipped electric motor 100 is not limited to the above method.

[0034] The anti-load side terminal block 13a is surrounded by a peripheral wall 19. The power lead wire 17 arranged in the power lead wire storage groove 18b is pulled out to the outside of the anti-load side terminal block 13a through a cutout portion 19a formed by cutting out a part of the peripheral wall 19. The anti-load side terminal block 13a and a circuit board 20 arranged on the anti-load side of the anti-load side terminal block 13a are covered with a cover 22 fitted into the bracket 9 to protect the components. The cover 22 is provided with an extraction portion 22a through which the power lead wire 17 is pulled out to the outside.

[0035] In the drive circuit mounted electric motor 100, by arranging the counter-load side terminal block 13a on which the circuit board 20 is mounted on the counter-load side of the counter-load side end face 9a of the bracket, it is possible to ensure a long physical distance between the drive circuit of the circuit board 20 and the coil 6. This makes it possible to prevent the drive circuit of the circuit board 20 from being adversely affected by electromagnetic noise generated by passing a current through the coil 6 of the stator 1, and to prevent malfunction of the drive circuit of the circuit board 20 due to electromagnetic noise.

[0036] Furthermore, in the drive circuit-equipped electric motor 100 according to the first embodiment, by arranging the metal bracket 9 on the anti-load side of the insulating member 16, the bracket 9 can reflect or absorb electromagnetic noise generated by passing a current through the coil 6 of the stator 1, and the bracket 9 can block electromagnetic noise traveling from the coil 6 to the anti-load side. This prevents the drive circuit of the circuit board 20, which is arranged on the anti-load side of the bracket 9, from being adversely affected by the electromagnetic noise in the drive circuit-equipped electric motor 100, and prevents malfunction of the drive circuit of the circuit board 20 due to electromagnetic noise.

[0037] That is, in the drive circuit-equipped electric motor 100, deterioration of the drive characteristics due to electromagnetic noise generated by passing a current through the coil 6 of the stator 1 does not occur. Therefore, the drive circuit-equipped electric motor 100 according to the first embodiment prevents deterioration of the drive characteristics of the drive circuit of the circuit board 20 due to electromagnetic noise generated by passing a current through the coil 6 of the stator 1, and it is possible to realize a drive circuit-equipped electric motor that is less likely to malfunction, has good drive circuit characteristics, and has improved safety and quality.

[0038] Furthermore, in the drive circuit-equipped electric motor 100 according to the first embodiment, the counter-load side terminal block 13a, on which the circuit board 20 is mounted, is disposed on the counter-load side end face 9a of the bracket 9, which is a substantially flat surface. The counter-load side terminal block 13a has an outer diameter substantially equal to the outer diameter of the counter-load side end face 9a of the bracket. Therefore, when a large circuit board 20 is mounted, the circuit board 20 can be disposed using the radial center region of the drive circuit-equipped electric motor 100, where the rotating shaft 3 and the second bearing 10b are disposed, while avoiding contact with the rotating shaft 3 and the second bearing 10b. This allows the drive circuit-equipped electric motor 100 to be compact, with a small radial size.

[0039] Furthermore, even when a larger circuit board 20 is mounted on the drive circuit mounted electric motor 100, the larger circuit board 20 can be mounted without increasing the radial size of the drive circuit mounted electric motor 100. In other words, the drive circuit mounted electric motor 100 can mount a larger circuit board 20 by effectively utilizing the internal space.

[0040] Furthermore, when using a resin bracket, it is difficult to achieve the high positional accuracy of the bearing housing, which requires high positional accuracy. For this reason, resin brackets equipped with bearing housings are typically formed by adding a cutting process after injection molding, or by integrally molding a metal bearing housing. This increases the cost of resin brackets. Furthermore, because the resin bracket must withstand the load applied to the rotating shaft 3, there are concerns that an increase in molding time due to thicker walls or an increase in cost due to the selection of a stronger material may occur.

[0041] In contrast, the electric motor 100 equipped with a drive circuit according to the first embodiment uses a metal bracket 9, which allows costs to be kept lower than when a plastic bracket is used, while still achieving the above-mentioned electromagnetic noise blocking effect.

[0042] Therefore, according to the drive circuit-equipped electric motor 100 of this embodiment 1, an electric motor with a drive circuit can be obtained at low cost, which makes effective use of the internal space, is resistant to electromagnetic noise from the coil 6 of the stator 1, and can accommodate a large circuit board 20 without increasing in size or deteriorating the characteristics.

[0043] Second Embodiment. Fig. 8 is a longitudinal cross-sectional view of a drive circuit-equipped electric motor 200 according to a second embodiment of the present invention. Fig. 9 is a perspective view of an assembled load-side terminal block 13b of the drive circuit-equipped electric motor 200 according to the second embodiment of the present invention. The drive circuit-equipped electric motor 200 according to the second embodiment differs from the drive circuit-equipped electric motor 100 according to the first embodiment in that the drive circuit-equipped electric motor 200 according to the second embodiment has a second terminal block, a third conductive pin 8c and a fourth conductive pin 8d instead of the first conductive pin 8a, and a fifth conductive pin 8e instead of the second conductive pin 8b. That is, the drive circuit-equipped electric motor 200 has a load-side terminal block 13b, which is a terminal block provided on the load side of the coil 6 and on the end surface of the insulator 5 on the load side. The load-side terminal block 13b has a hole through which the fourth conductive pin 8d passes and is located on the load side relative to the counter-load-side terminal block 13a. The load-side terminal block 13b is located in an area outside the second bearing housing 11b in the radial direction of the stator 1.

[0044] The load side terminal block 13b is formed of an insulating material such as resin in the shape of a shallow, annular container. The inner diameter of the load side terminal block 13b and the outer diameter of the second bearing housing 11b are approximately equal, and the load side terminal block 13b and the second bearing housing 11b are arranged with their axes aligned. The load side terminal block 13b is press-fitted onto the outer periphery of the second bearing housing 11b. The load side terminal block 13b is also arranged with its axes aligned with the rotor 2 and the stator 1. Therefore, the load side terminal block 13b is provided between the anti-load side end face 9a of the bracket and the anti-load side coil 6, extending from the outer periphery of the rotor 2 to the stator 1 in the radial direction of the rotating shaft 3.

[0045] The load side terminal block 13b is provided with a plurality of load side terminals 14b used for wiring, each having a hole through which the third conductive pin 8c passes and a hole through which the fourth conductive pin 8d passes, and a temperature fuse 15 which is an overheating prevention device for the coil 6 that detects an overheating of the coil 6 and prevents the overheating of the coil 6 as necessary, and is housed and arranged in a recess provided in the load side terminal block 13b.

[0046] The third conductive pin 8c and the fourth conductive pin 8d are coil connection conductive pins for electrically connecting the coil 6 and the circuit board 20. The third conductive pin 8c is inserted into the inner bottom surface of the load-side terminal block 13b on the anti-load side of the insulator 5 and extends upright toward the anti-load side. The third conductive pin 8c protrudes in the axial direction to the anti-load side of the circuit board 20. The third conductive pin 8c is disposed to extend from the inner bottom surface of the load-side terminal block 13b, penetrate through the load-side terminal 14b, insulating member 16, bracket 9, the bottom surface of the anti-load-side terminal block 13a, and the circuit board 20, and to electrically connect the circuit board 20 and the load-side terminal 14b.

[0047] The fourth conductive pin 8d stands upright on the top surface of the insulator 5, i.e., the surface on the anti-load side of the insulator 5, extending toward the anti-load side. The fourth conductive pin 8d extends from the insulator 5 through the bottom surface of the load-side terminal block 13b and the load-side terminal 14b toward the anti-load side, electrically connecting the coil 6 to the load-side terminal 14b. Like the first conductive pin 8a, the end of the coil 6 is wound around the fourth conductive pin 8d multiple times and is electrically connected to the end of the coil 6 by soldering. On the other hand, the end of the coil 6 is not wound around the third conductive pin 8c. The third conductive pin 8c is electrically connected to the coil 6 via the load-side terminal 14b and the fourth conductive pin 8d, and is not directly electrically connected to the coil 6.

[0048] The fifth conductive pin 8e is an external power supply connecting conductive pin for electrically connecting the circuit board 20 to an external power supply (not shown). The fifth conductive pin 8e is inserted into the inner bottom surface of the load side terminal block 13b on the anti-load side of the insulator 5 and extends upright toward the anti-load side. The fifth conductive pin 8e protrudes in the axial direction to the anti-load side of the circuit board 20. The fifth conductive pin 8e is disposed to extend from the inner bottom surface of the load side terminal block 13b through the insulating member 16, the bracket 9, the bottom surface of the anti-load side terminal block 13a, the anti-load side terminal 14a, and the circuit board 20 to the anti-load side, electrically connecting the anti-load side terminal 14a and the circuit board 20.

[0049] Therefore, in the second embodiment, insulating member 16 is provided with a hole through which third conductive pin 8c and fifth conductive pin 8e pass, and bracket 9 is provided with a hole through which third conductive pin 8c and fifth conductive pin 8e pass.

[0050] The load-side terminal block 13b uses load-side terminals 14b to electrically connect the fourth conductive pin 8d connected to the coil 6, the thermal fuse 15, the multiple third conductive pins 8c connected to the drive circuit of the circuit board 20, and electronic components mounted inside the motor. The fourth conductive pin 8d and the load-side terminal 14b are electrically connected by soldering or welding. The third conductive pin 8c and the load-side terminal 14b are electrically connected by soldering or welding. The load-side terminal 14b and the thermal fuse 15 are also electrically connected by soldering or welding. The multiple load-side terminals 14b are individually configured to be electrically connected to their respective locations. Similarly, the multiple third conductive pins 8c are individually configured to be electrically connected to their respective locations.

[0051] FIG. 10 is a diagram schematically illustrating electrical connection paths in a drive circuit-equipped electric motor 200 according to a second embodiment of the present invention. In the drive circuit-equipped electric motor 200, a counter-load side terminal 14a electrically connected to an external power supply via a power supply lead 17 is disposed on a counter-load side terminal block 13a. A fifth conductive pin 8e electrically connects the counter-load side terminal 14a to a circuit board 20. That is, in the drive circuit-equipped electric motor 200, the power supply lead 17, the circuit board 20, and the counter-load side terminal 14a are disposed on the counter-load side terminal block 13a, as in the first embodiment. The circuit board 20 is connected to an external power supply via the power supply lead 17. The circuit board 20 is also electrically connected to a load side terminal 14b via a third conductive pin 8c. The load side terminal 14b is then electrically connected to the coil 6 via a fourth conductive pin 8d.

[0052] Therefore, in drive circuit-equipped electric motor 200, the external power supply, power supply lead wire 17, anti-load side terminal 14a, fifth conductive pin 8e, circuit board 20, third conductive pin 8c, load side terminal 14b, fourth conductive pin 8d, and coil 6 are electrically connected in this order. Commercial AC voltage is applied to circuit board 20 from the external power supply via power supply lead wire 17, anti-load side terminal 14a, and fifth conductive pin 8e.

[0053] In drive circuit equipped electric motor 200, when commercial AC voltage is applied to circuit board 20 from the outside, the commercial AC voltage is converted to DC voltage by a power supply circuit mounted on circuit board 20. Then, when the DC voltage is switched on in the control circuit of the drive circuit mounted on circuit board 20, a current flows in a specific direction from circuit board 20 to coil 6 of stator 1 via electrically connected third conductive pin 8c, load side terminal 14b, and fourth conductive pin 8d, causing rotor 2 to rotate.

[0054] The drive circuit mounted electric motor 200 according to the second embodiment described above has the same effects as the drive circuit mounted electric motor 100 according to the first embodiment.

[0055] In the drive circuit-equipped electric motor 200, a load-side terminal block 13b is disposed between the anti-load end face 9a of the bracket and the anti-load-side coil 6 in order to ensure a longer physical distance between the coil 6 and the circuit board 20 than in the drive circuit-equipped electric motor 100 and to effectively utilize the space between the coil 6 and the circuit board 20. As a result, in the drive circuit-equipped electric motor 200, electrical connection between the fourth conductive pins 8d electrically connected to different coils 6 wound in different stator slots 1a in the stator 1 can be made by the load-side terminals 14b disposed on the load-side terminal block 13b. In other words, different coils 6 can be electrically connected to each other via the load-side terminals 14b on the load-side terminal block 13b.

[0056] This eliminates the need to connect the fourth conductive pins 8d together using the drive circuit of the circuit board 20, making it possible to simplify the drive circuit. In Figure 9, the fourth conductive pins 8da and 8db are electrically connected to different coils 6 (not shown) wound in different stator slots 1a in the stator 1, and are electrically connected to the load side terminals 14ba and 14bb via the electrical connection parts 12.

[0057] In the drive circuit-equipped electric motor 200, a thermal fuse 15, which is a device for preventing the coil 6 from overheating, can be disposed in the load-side terminal block 13b as needed. By disposing the thermal fuse 15 in the load-side terminal block 13b, the distance between the coil 6 (heat source) and the thermal fuse 15 can be shortened, improving the thermal response of the thermal fuse 15 to the coil 6. The thermal fuse 15 is preferably disposed in an area of ​​the counter-load-side terminal block 13a that corresponds to the coil 6 within the surface of the counter-load-side terminal block 13a. This allows the thermal fuse 15 to be disposed closer to the coil 6 (heat source), improving the thermal response of the thermal fuse 15 and reliably preventing the coil 6 from overheating.

[0058] Therefore, the drive circuit mounted electric motor 200 can be realized as an electric motor mounted with a drive circuit that is less likely to malfunction, has good drive characteristics of the drive circuit, and has improved safety and quality.

[0059] Third Embodiment Fig. 11 is a longitudinal cross-sectional view of a drive circuit-equipped electric motor 300 according to a third embodiment of the present invention. Fig. 12 is a top view showing an interior permanent magnet rotor 25 of the drive circuit-equipped electric motor 300 according to the third embodiment of the present invention. The drive circuit-equipped electric motor 300 according to the third embodiment differs from the drive circuit-equipped electric motor 200 according to the second embodiment in that the drive circuit-equipped electric motor 300 according to the third embodiment includes an interior permanent magnet rotor 25 instead of the rotor 2.

[0060] The interior permanent magnet rotor 25 is a rotor having permanent magnet insertion holes 27 arranged at a predetermined interval in a plurality of locations on a rotor core 26 formed by laminating a number of thin electromagnetic steel plates of the same ring shape as shown in Fig. 12, and permanent magnets 28 embedded in the permanent magnet insertion holes 27. In other words, the interior permanent magnet rotor 25 is an interior permanent magnet rotor having permanent magnets 28 embedded in a plurality of locations on a rotor core 26 formed by laminating a number of electromagnetic steel plates of the same ring shape.

[0061] The drive circuit mounted electric motor 300 according to the third embodiment described above also has the same effects as the drive circuit mounted electric motor 100 according to the first embodiment.

[0062] Furthermore, even if an embedded magnet rotor 25 is used instead of the rotor 2 in the drive circuit-equipped electric motor 100 according to the first embodiment described above, the same effects as those of the drive circuit-equipped electric motor 100 according to the first embodiment can be obtained.

[0063] The configurations shown in the above embodiments are examples of the content of the present invention, and it is possible to combine the technologies of the above embodiments with each other, or to combine them with other known technologies, and it is also possible to omit or modify part of the configurations within the scope that does not deviate from the gist of the present invention.

[0064] DESCRIPTION OF SYMBOLS 1 Stator, 1a Stator slot, 2 Rotor, 2a Central shaft, 3 Rotating shaft, 3a One end, 4 Stator core, 5 Insulator, 6 Coil, 7 Frame, 8a First conductive pin, 8b Second conductive pin, 8c Third conductive pin, 8d, 8da, 8db Fourth conductive pin, 8e Fifth conductive pin, 9 Bracket, 9a End surface of bracket on the opposite load side, 9b Through hole, 10a First bearing, 10b Second bearing, 11a First bearing housing, 11b Second bearing housing, 12 Electrical connection part, 13a Opposite load side terminal block, 13b Load side terminal block, 14a Opposite load side terminal, 14b, 14ba, 14bb Load side terminal, 15 Thermal fuse, 16 Insulating member, 16a Flat portion, 16b Side portion, 16c Protrusion, 17 Power supply lead wire, 18a Terminal storage section, 18b power lead wire storage groove, 19 peripheral wall, 19a cutout section, 20 circuit board, 21 inner bottom surface, 22 cover, 22a drawer section, 23 inner peripheral surface, 24 protrusion, 25 embedded magnet rotor, 26 rotor core, 27 permanent magnet insertion hole, 28 permanent magnet, 100, 200, 300 drive circuit equipped electric motor.

Claims

DEPCT641. An integrated drive circuit motor in which the outer part consists of a tubular rotor, including a rotating shaft fixed to the center, and permanent magnets; a stator, which is arranged on the outer side of the rotor, where the stator includes an iron core and several windings wound around a winding frame, with the winding frame between them; an opposite-load slip bearing supporting the rotating shaft, with one side in the axial direction of the rotating shaft being the load side and the other side in the axial direction of the rotating shaft being the opposite-load side; a metal bracket, which is arranged on the opposite-load side relative to the rotor and stator, in which the bracket includes a slip bearing housing, which extends towards the load side and secures the opposite-load slip bearing; an opposite-load terminal block, which is arranged on the opposite-load side relative to the bracket in the axial direction; and a circuit substrate, which is arranged on the opposite-load side of the opposite-load terminal block, in which the drive circuit is mounted on the circuit substrate.The integrated motor drive circuit according to claim 1 consists of an opposite-load terminal electrically connected to an external power supply and is mounted on an opposite-load terminal block with a first-conducting latch arranged in such a way that the first-conducting latch extends from the winding body towards the opposite-load side while passing through the housing and the opposite-load terminal block where the first-conducting latch connects the winding and the electrical circuit substrate, and a second-conducting latch arranged in such a way that the second-conducting latch extends from the winding body towards the opposite-load side while passing through the housing and the opposite-load terminal block where the second-conducting latch connects the opposite-load terminal and the electrical circuit substrate. 3.The integrated motor drive circuit according to claim 1 is assembled with an opposite-load terminal that is electrically connected to an external power supply and is placed on an opposite-load terminal block. The load terminal block is placed between the windings and the load terminal holder. The load terminal block is placed on the load terminal block. A third conducting latch is placed in such a way that the third conducting latch extends from the load terminal block towards the opposite-load side while passing through the holder and the opposite-load terminal block, where the third conducting latch connects the circuit substrate and the electrical load terminal. A fourth conducting latch is placed in such a way that the fourth conducting latch extends from the windings towards the opposite-load side while passing through the load terminal block, where the fourth conducting latch connects the windings and the electrical load terminal. And a fifth conducting latch is placed in such a way that the fifth conducting latch extends from the load terminal block towards the opposite-load side while passing through the holder and the opposite-load terminal block, where the fifth conducting latch connects the opposite-load terminal and the electrical circuit substrate. 4.

5. Integrated drive motor under claim 3 where different windings are electrically connected via load terminals on a load terminal block.

6. Integrated drive motor under claim 2 or 3 where the lead wires connecting the external power supply and the opposite-load terminals are placed on an opposite-load terminal block.

7. Integrated drive motor under claim 1 where the drive circuit performs sensorless drive control to control rotor rotation by operating a control that causes current to flow through a given winding in a given direction based on information about the back electromotive force generated by the windings passing through the rotor's magnetic flux.

8. Integrated drive motor under claim 7 where the rotor includes plastic magnets. 9.An integrated drive motor under claim 7, where the rotor is an internal permanent magnet rotor in which permanent magnets are embedded at a number of locations in the rotor axis, which is constructed by stacking a number of identical ring-shaped magnetic steel plates.